Studied Official guide from AWS (book in kindle form) and it’s tests
some free tests
listen acloudguru videos (some major ones twice)
Little bit of whitepapers
Then General tests with whizlabs
Then service specific tests with whizlabs
one test from udemy

whizlabs test really helped. Score badly in service specific tests. But answers to these tests really help in firming up the understanding.

In exam, it was really tensed. Spent entire time. Even then was not sure what is finally going to happen.